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| PR:Q9USU9 | transcription initiation factor IIA large subunit (Schizosaccharomyces pombe 972h-) | | |  | | |
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| PR:P52654 | transcription initiation factor IIA subunit 1 (fruit fly) | | |  | | |
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| PR:P52654-1 | transcription initiation factor IIA subunit 1 isoform A (fruit fly) | | |  | | |
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| PR:P52654-2 | transcription initiation factor IIA subunit 1 isoform B (fruit fly) | | |  | | |
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| PR:P52654-3 | transcription initiation factor IIA subunit 1 isoform C (fruit fly) | | |  | | |
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| PR:P52655 | transcription initiation factor IIA subunit 1 (human) | | |  | | |
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| PR:000079298 | transcription initiation factor IIA subunit 1 cysteinylated 1 (human) | | |  | | |
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| PR:P52655-2 | transcription initiation factor IIA subunit 1 isoform h37 kDa (human) | | |  | | |
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| PR:P52655-1 | transcription initiation factor IIA subunit 1 isoform h42 kDa (human) | | |  | | |
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| PR:000080219 | transcription initiation factor IIA subunit 1 methylated 1 (human) | | |  | | |
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| PR:Q99PM3 | transcription initiation factor IIA subunit 1 (mouse) | | |  | | |
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| PR:O08949 | transcription initiation factor IIA subunit 1 (rat) | | |  | | |
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| PR:000020072 | transcription initiation factor IIA subunit 1 proteolytic cleavage product | | |  | | |
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| PR:000020071 | transcription initiation factor IIA subunit 1, initiator methionine removed form | | |  | | |